CoccydyniaNCT07533617
Chair-Integrated Foam Modifications in Coccydynia
A study testing Ergonomic Chair with Foam Type A, Ergonomic Chair with Foam Type B and Ergonomic Chair with Foam Type C in people with Coccydynia, run by KTO Karatay University at 1 site in Turkey (Türkiye).
Trial summary
The aim of this study is to evaluate the effects of chairs with different ergonomic designs on quality of life, discomfort, and pain in individuals with coccydynia (tailbone pain). Read more about this study
- Who is it for?
- Ages 18 to 65 years
- Conditions the study is for
- Coccydynia
- What is being tested?
- Ergonomic Chair with Foam Type A, Ergonomic Chair with Foam Type B and Ergonomic Chair with Foam Type C
- Type of treatment
- Medical device
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 48 participants
- Where
- 1 siteTurkey (Türkiye)
- Study dates
- 1 May 2026to 15 Jun 2026
- Phase
- Interventional
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 to 65 years
- All sexes
- No healthy volunteers
- Adult, Older adult
Who may be able to join
- Aged between 18 and 65 years
- Working at a desk for at least 5-6 hours per day
- Experiencing coccydynia (tailbone pain)
- Able to sit independently without assistive support
- No diagnosed spinal disorders (e.g., lumbar disc herniation)
- Willing to use the assigned chair during working hours for 1 week
- Able to understand and complete questionnaires
- Provided written informed consent
Who cannot join
- History of spinal surgery
- Diagnosed spinal disorders (e.g., lumbar disc herniation, scoliosis, severe degenerative spine disease)
- Neurological disorders affecting posture, sitting balance, or sensation
- Severe musculoskeletal conditions (e.g., hip or pelvic disorders) that may affect sitting
- Pregnancy
- Inability to sit for prolonged periods
- Use of assistive seating devices (e.g., orthopedic cushions) during the study period
- Regular use of pain medication that may affect outcome measures
Trial locations and contacts
1 site in 1 country.
About this study
Official title: Ergonomic Effects of Material- and Geometry-Modified, Chair-Integrated Foams on Pressure Distribution, Pain, and Sitting Comfort in Individuals With Coccydynia
The aim of this study is to evaluate the effects of chairs with different ergonomic designs on quality of life, discomfort, and pain in individuals with coccydynia (tailbone pain).
Read the detailed description
Participants aged 18-65 years who work at a desk for at least 5-6 hours per day will be included in the study. Information such as age, height, body weight, education level, family type, smoking status, sex, marital status, working posture (sitting, standing, or both), duration of working hours, job type (production or administrative), regular exercise habits, presence of chronic diseases, and absence of any spinal problems (e.g., no diagnosed lumbar disc herniation) will be recorded. Participants will be randomly assigned to six groups. Before using the chairs, participants will be seated on a load cell-equipped chair to assess weight distribution. The distribution of body weight across different regions while sitting will be recorded in kilograms. This measurement will be repeated three times, and the average will be recorded.
After the measurement, participants will be provided with specially designed chairs and asked to work using these chairs. Six different chair designs will be developed for the study. The reason for having six types of chairs is that the foam properties used in each chair will differ from one another.
- Conditions
- Coccydynia
- Being tested
- Ergonomic Chair with Foam Type A, Ergonomic Chair with Foam Type B, Ergonomic Chair with Foam Type C, Ergonomic Chair with Foam Type D, Ergonomic Chair with Foam Type E
- Keywords
- Chair ergonomics, Foam geometry, Coccydynia, Pain, Pressure distribution, Sitting comfort
- Medical subject headings
- Pain
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Ergonomic Chair with Foam Type ADevice
Ergonomic chair incorporating Foam Type A.
Ergonomic Chair with Foam Type BDevice
Ergonomic chair incorporating Foam Type B.
Ergonomic Chair with Foam Type CDevice
Ergonomic chair incorporating Foam Type C.
Ergonomic Chair with Foam Type DDevice
Ergonomic chair incorporating Foam Type D
Ergonomic Chair with Foam Type EDevice
Ergonomic chair incorporating Foam Type E
Ergonomic Chair with Foam Type FDevice
Ergonomic chair incorporating Foam Type F
| Study group | Role | What they receive |
|---|---|---|
| Group 1: Chair with Foam Type A | Experimental | Participants will use ergonomically modified chair A with different foam properties during their working hours. Receives: Device: Ergonomic Chair with Foam Type A |
| Group 2: Chair with Foam Type B | Experimental | Participants will use ergonomically modified chair B with different foam properties during their working hours. Receives: Device: Ergonomic Chair with Foam Type B |
| Group 3: Chair with Foam Type C | Experimental | Participants will use ergonomically modified chair C with different foam properties during their working hours. Receives: Device: Ergonomic Chair with Foam Type C |
| Group 4: Chair with Foam Type D | Experimental | Participants will use ergonomically modified chair D with different foam properties during their working hours. Receives: Device: Ergonomic Chair with Foam Type D |
| Group 5: Chair with Foam Type E | Experimental | Participants will use ergonomically modified chair E with different foam properties during their working hours. Receives: Device: Ergonomic Chair with Foam Type E |
| Group 6: Chair with Foam Type F | Experimental | Participants will use ergonomically modified chair F with different foam properties during their working hours. Receives: Device: Ergonomic Chair with Foam Type F |
What is being measured
The primary outcome is the main question the study is designed to answer.
Pressure Distribution Measurement (Load Cell-Equipped Chair System)
Assessment of sitting pressure distribution across right, left, and central regions in kilograms using a custom-designed load cell-integrated chair.
Measured: Baseline + 1 week
Paris Questionnaire
Evaluation of pain and functional status associated with coccydynia.
Measured: Baseline + 1 week
Secondary outcomes (2)
Extended Nordic Musculoskeletal Questionnaire (NMQ-E)
Evaluation of musculoskeletal symptoms related to different body regions.
Measured: Baseline + 1 week
EuroQol Quality of Life Scale (EQ-5D-3L)
Assessment of general health-related quality of life.
Measured: Baseline + 1 week
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted16 Apr 2026
- Study start1 May 2026
- Primary completion1 Jun 2026
- Study completion15 Jun 2026
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for CoccydyniaStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase N/A
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Model description
- Participants will be randomly assigned to six parallel groups, each receiving a different chair design with distinct foam properties.
- Masking
- None (open label)
- Enrolment
- 48 participants (actual)
Sponsor and investigators
- Lead sponsor
- KTO Karatay University
- Sponsor type
- University, hospital or other
- Responsible party
- Sponsor
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT07533617
- Sponsor's protocol ID
- 2024/002
- Status last verified
- Apr 2026
- First submitted
- 10 Apr 2026
- Last updated
- 13 Jul 2026
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- No: Individual participant data (IPD) will not be shared due to privacy and confidentiality considerations.
Study at a glance
From the registry record, last updated by the sponsor on 13 Jul 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Ergonomic Effects of Material- and Geometry-Modified, Chair-Integrated Foams on Pressure Distribution, Pain, and Sitting Comfort in Individuals With Coccydynia
- ClinicalTrials.gov ID
- NCT07533617
- Acronym / sponsor ID
- 2024/002
- Conditions
- Coccydynia
- Keywords
- Chair ergonomics, Foam geometry, Coccydynia, Pain, Pressure distribution, Sitting comfort
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 48 participants (actual)
- Lead sponsor
- KTO Karatay UniversityUniversity, hospital or other
- Study start
- 1 May 2026 (actual)
- Primary completion
- 1 Jun 2026 (actual)
- Study completion
- 15 Jun 2026 (actual)
- First posted
- 16 Apr 2026 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
The aim of this study is to evaluate the effects of chairs with different ergonomic designs on quality of life, discomfort, and pain in individuals with coccydynia (tailbone pain).
Detailed description
Participants aged 18-65 years who work at a desk for at least 5-6 hours per day will be included in the study. Information such as age, height, body weight, education level, family type, smoking status, sex, marital status, working posture (sitting, standing, or both), duration of working hours, job type (production or administrative), regular exercise habits, presence of chronic diseases, and absence of any spinal problems (e.g., no diagnosed lumbar disc herniation) will be recorded. Participants will be randomly assigned to six groups. Before using the chairs, participants will be seated on a load cell-equipped chair to assess weight distribution. The distribution of body weight across different regions while sitting will be recorded in kilograms. This measurement will be repeated three times, and the average will be recorded.
After the measurement, participants will be provided with specially designed chairs and asked to work using these chairs. Six different chair designs will be developed for the study. The reason for having six types of chairs is that the foam properties used in each chair will differ from one another.
Study design
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- None (open label)
- Number of arms
- 6
- Model description
- Participants will be randomly assigned to six parallel groups, each receiving a different chair design with distinct foam properties.
| Arm | Type | Receives |
|---|---|---|
| Group 1: Chair with Foam Type A | Experimental | Device: Ergonomic Chair with Foam Type AParticipants will use ergonomically modified chair A with different foam properties during their working hours. |
| Group 2: Chair with Foam Type B | Experimental | Device: Ergonomic Chair with Foam Type BParticipants will use ergonomically modified chair B with different foam properties during their working hours. |
| Group 3: Chair with Foam Type C | Experimental | Device: Ergonomic Chair with Foam Type CParticipants will use ergonomically modified chair C with different foam properties during their working hours. |
| Group 4: Chair with Foam Type D | Experimental | Device: Ergonomic Chair with Foam Type DParticipants will use ergonomically modified chair D with different foam properties during their working hours. |
| Group 5: Chair with Foam Type E | Experimental | Device: Ergonomic Chair with Foam Type EParticipants will use ergonomically modified chair E with different foam properties during their working hours. |
| Group 6: Chair with Foam Type F | Experimental | Device: Ergonomic Chair with Foam Type FParticipants will use ergonomically modified chair F with different foam properties during their working hours. |
Who may qualify
- Ages
- 18 to 65 years
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (8 listed)
- Aged between 18 and 65 years
- Working at a desk for at least 5-6 hours per day
- Experiencing coccydynia (tailbone pain)
- Able to sit independently without assistive support
- No diagnosed spinal disorders (e.g., lumbar disc herniation)
Key exclusion criteria (8 listed)
- History of spinal surgery
- Diagnosed spinal disorders (e.g., lumbar disc herniation, scoliosis, severe degenerative spine disease)
- Neurological disorders affecting posture, sitting balance, or sensation
- Severe musculoskeletal conditions (e.g., hip or pelvic disorders) that may affect sitting
- Pregnancy
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Ergonomic Chair with Foam Type AErgonomic chair incorporating Foam Type A. | Device | Group 1: Chair with Foam Type A |
| Ergonomic Chair with Foam Type BErgonomic chair incorporating Foam Type B. | Device | Group 2: Chair with Foam Type B |
| Ergonomic Chair with Foam Type CErgonomic chair incorporating Foam Type C. | Device | Group 3: Chair with Foam Type C |
| Ergonomic Chair with Foam Type DErgonomic chair incorporating Foam Type D | Device | Group 4: Chair with Foam Type D |
| Ergonomic Chair with Foam Type EErgonomic chair incorporating Foam Type E | Device | Group 5: Chair with Foam Type E |
| Ergonomic Chair with Foam Type FErgonomic chair incorporating Foam Type F | Device | Group 6: Chair with Foam Type F |
Primary outcome
Pressure Distribution Measurement (Load Cell-Equipped Chair System)
Time frame: Baseline + 1 week
Assessment of sitting pressure distribution across right, left, and central regions in kilograms using a custom-designed load cell-integrated chair.
Paris Questionnaire
Time frame: Baseline + 1 week
Evaluation of pain and functional status associated with coccydynia.
2 secondary outcomes
Extended Nordic Musculoskeletal Questionnaire (NMQ-E)
Time frame: Baseline + 1 week
EuroQol Quality of Life Scale (EQ-5D-3L)
Time frame: Baseline + 1 week
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 13 Jul 2026.
- Individual participant dataSharing planned: No. Individual participant data (IPD) will not be shared due to privacy and confidentiality considerations.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
The record lists no contact. Use the official record to reach the sponsor.
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing Ergonomic Chair with Foam Type A, Ergonomic Chair with Foam Type B and Ergonomic Chair with Foam Type C in people with Coccydynia, run by KTO Karatay University at 1 site in Turkey (Türkiye).
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 8 inclusion and 8 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 13 Jul 2026. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in Turkey (Türkiye). Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Pressure Distribution Measurement (Load Cell-Equipped Chair System) (time frame: Baseline + 1 week). The study lists 2 primary outcomes in all. It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 13 Jul 2026.